Saxon
Support for DOM, JDOM, DOM4J, and XOM
JAXP interface (transformation, XPath, schema processing)
XML Schema 1.0 implementation
XPath 2.0 implementation
XSLT 2.0 implementation
XQuery 1.0 implementation
Functions, operators, and data types for XPath 2.0
Serialization
Saxon extensions to the W3C XSLT/XQuery specifications
Internal changes
Pull processing